package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.annotation.AutoFill;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.enumeration.OperationType;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @author 陈秋雨
 * @version 1.0
 * @description:
 * @date 2024/02/22 下午 9:32
 */
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;


    /**
     * 新增菜品和对应的口味
     * 多表插入
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert菜品主键id
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        //先判断集合是否有数据
        if (flavors != null && flavors.size() > 0) {
            //给每个口味赋予菜品id
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }


    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //设置分页条件
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        //开始分页查询 多表分页查询
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        //封装数据
        PageResult pageResult = PageResult.builder()
                .total(page.getTotal())
                .records(page.getResult())
                .build();

        return pageResult;
    }

    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Transactional
    public void deleteByIds(List<Long> ids) {

        //起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //起售中的菜品不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        List<Long> setmealIds = setmealMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品关联了套餐,不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        for (Long id : ids) {
//            //批量删除菜品
//            dishMapper.deleteById(id);
//            //删除菜品后，关联的口味数据也需要删除
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //优化sql :delete from dish where id in(?,?,?)
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品信息和对应的口味信息
     *
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //两张表 菜品表 口味表
        //修改菜品基本信息
        dishMapper.update(dish);
        //删除原有的口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();

        //先判断集合是否有数据
        if (flavors != null && flavors.size() > 0) {
            //给每个口味赋予菜品id
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品起售、停售
     *
     * @param status
     * @param id     菜品id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        //可以使用之前的update方法
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            //如果菜品停售，还需要将包含当前菜品的套餐也停售（一个菜品关联多个套餐）
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (? , ? , ?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal
                            .builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();

                    //将套餐也停售
                    setmealMapper.update(setmeal);
                }

            }
        }
    }

    /**
     * 根据分类id查询菜品数据
     *
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish
                .builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}

















